ถามเรื่องการไม่แสดงข้อมูลซ้ำ ในตารางที่มีการจัดเรียงข้อมูล

SET NOCOUNT OFF;

DECLARE @tmp_TableA TABLE (grpName varchar(10), 
                           grpValue varchar(10), 
                           grpID int, 
                           rowID int)

INSERT INTO @tmp_TableA
SELECT 'หอย', 'value1', 1, 1 UNION
SELECT 'หอย', 'value2', 1, 2 UNION
SELECT 'งาม', 'value3', 2, 3 UNION
SELECT 'งาม', 'value4', 2, 4 UNION
SELECT 'เพราะ', 'value5', 3, 5 UNION
SELECT 'เพราะ', 'value6', 3, 6 UNION
SELECT 'ขน', 'value7', 4, 7 UNION
SELECT 'ขน', 'value8', 4, 8 UNION
SELECT 'คน', 'value9', 5, 9 UNION
SELECT 'งาม', 'value10', 6, 10 UNION
SELECT 'เพราะ', 'value11', 7, 11

DECLARE @cnt int = 1;
DECLARE @max int = (SELECT MAX(rowID) FROM @tmp_TableA);--DECLARE @max int = (SELECT MAX(rowID) FROM @tmp_TableA);
DECLARE @grpIDOld int = 0
DECLARE @grpIDNew int = 0
DECLARE @grpName varchar(10) = ''

WHILE (@cnt <= @max) BEGIN
    SELECT @grpName = GrpName, @grpIDNew = GrpID FROM @tmp_TABLEA WHERE rowID = @cnt
    --SELECT @grpName = GrpName, @grpIDNew = GrpID FROM @tmp_TABLEA WHERE rowID = @cnt
    IF @@ROWCOUNT > 0 BEGIN
	   --SET NOCOUNT ON -- OR PRINT 'Hi' for Reset RowCount = 0
	   IF @grpIDOld <> @grpIDNew BEGIN	     
  	     SET @grpIDOld = @grpIDNew
	     PRINT CAST(@cnt AS VARCHAR) + N' เปลียนกลุ่ม'
  	   END
  	   ELSE BEGIN	   
	       UPDATE @tmp_TABLEA SET GrpName = '' WHERE rowID = @cnt --UPDATE @tmp_TABLEA SET GrpName = '' WHERE rowID = @cnt
	       END
	   -- IF ELSE can Reset RowCount = 0
	  END
	ELSE BEGIN
	  PRINT CAST(@cnt AS VARCHAR) + N' หาไม่เจอ'       
	  END    
    SET @cnt = @cnt + 1
END

SELECT * FROM @tmp_TAbleA ORDER BY grpID 
GO